The borophosphates are mixed anion compounds containing borate and phosphate anions, which may be joined together by a common oxygen atom. Compounds that contain water or hydroxy groups can also be included in the class of compounds. [1]
Borophosphates can be classified by whether or not they are hydrated, and the anion structure, which can be single, double, triple, isolated ring, isolated branched ring, simple chain, branched chain, loop chain, layers, or three-dimensional network. [1] The single anion compounds are the borate phosphates, which contain separate borate and phosphate groups. Some of the borophosphate structures resemble silicates. [1]
Related compounds include aluminophosphates, which have aluminium instead of boron, gallophosphates, [2] with gallium in place of boron, and by substituting the phosphate: boroarsenates, boroantimonates, vanadoborate.
Borophosphates can be formed by heating compounds together at up to 900 °C. The products are dense, anhydrous, and do not contain organic substances. [2]
Solvothermal synthesis uses a non water solvent such as ethylene glycol to dissolve the product. [2]
The flux method crystallises from a molten flux of boric acid and sodium dihydrogen phosphate at around 171. [3]
The hydrothermal method heats the ingredients with water under pressure up to 200 °C. The ingredients are boric acid, phosphoric acid, metal salts, or organic bases. Products often contain hydrogen. [2]
The ionothermal synthesis method uses an ionic liquid such as 1-alkyl-3-methylimidazolium bromide as a solvent. This can be done at atmospheric pressure and temperatures under 100 °C. [2]
Borophosphate compounds have been investigated for magnetic, electrical, optical and catalytic properties. Some borophosphates are porous and so have surface for interaction on their interiors, not just their surface. They can reversibly absorb water, or have channels that can allow ions to conduct. The reflection of a labelled tetrahedron cannot be superimposed (even with rotation or movements), so the compounds containing phosphate and borate tetrahedrons can be non-centrosymmetric, or chiral. [2]
name | formula | crystal system | space group | unit cell Å | volume | density | comment | refs |
---|---|---|---|---|---|---|---|---|
Li[B3PO6(OH)3] | looped chain B3O3 rings OH on B and P | [1] | ||||||
Li2B3PO8 | P1 | [2] | ||||||
Li3BP2O8 | P1 | [2] | ||||||
NH4BeBP2O8·1/3H2O | cubic | P213 | zeolite-ANA structure | [4] | ||||
(NH4)2[B3PO7(OH)2] | looped chain B3O3 rings OH on B | [1] | ||||||
(NH4)3H2[BOB(PO4)3] | infinite chains | [5] | ||||||
(NH4)4[H2B2P4O16] | P41212 | [2] | ||||||
Na2[BP2O7(OH)] | orthorhombic | Pna21 | a=6.8236, b=20.7911, c=13.1446, Z=12 | layers | [6] | |||
Na3B6PO13 | orthorhombic | Pnma | a=9.3727, b=16.2307, c=6.7232, Z=4 | 8 member rings | [3] | |||
Na3BP2O8 | monoclinic | C2/c | a=12.567, b=10.290, c=10.210, β=92.492, Z=2 | infinite chains | [3] | |||
Na5[BOB(PO4)3)] | infinite chains | [5] | ||||||
NaBeBP2O8·1/3H2O | cubic | P213 | zeolite-ANA structure | [4] | ||||
Na13(H2O)2[B6P11O42(OH)2]Cl2·H2O | F23 | [2] | ||||||
MgBPO4(OH)2 | P3121 | [2] | ||||||
dimagnesium (monohydrogenmonophosphatedihydrogenmonoboratemonophosphate) | Mg2[BP2O7(OH)3] | triclinic | P1 | a=6.452, b=6.455, c=8.360, α=82.50, β=82.56, γ=80.98, Z=1 | 338.8 | triple | [7] | |
(H3O)Mg(H2O)2[BP2O8]·H2O | P6122 | [2] | ||||||
Mg3(H2O)6(B(OH)3PO4)2 | double | [1] | ||||||
LiMg(H2O)2[BP2O8]·H2O | P6522 | [2] | ||||||
NaMg(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.428, c=15.820 | loop branched chain | [8] | |||
Na2[MgB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.771, c=12.100, Z=6 | 2.537 | colourless | [9] | ||
K3B4PO10 | triclinic | P1 | a=6.546, b=6.567, c=12.930, α=86.04, β=81.40, γ=60.42, Z=2 | 477.9 | 2.443 | colourless 2D sheet | [10] | |
K7B2P5O19 | [2] | |||||||
K3[B5PO10(OH)3] | loop branch | [1] | ||||||
LiK2BP2O8 | P21/n | [2] | ||||||
Li3K2BP4O14 | Cmca | [2] | ||||||
KBeBP2O8·1/3H2O | cubic | P213 | a=12.427, Z=12 | 1,919 | zeolite-ANA structure | [4] | ||
KMg(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.463, c=15.815 | loop branched chain | [8] | |||
Ca[BPO5] | loop branch B2PO3 rings | [1] | ||||||
Sc(H2O)2[BP2O8]·H2O | hexagonal | P6522 | a=9.5752, c=15.8145, Z=6 | 1,255.7 | 2.378 | [11] | ||
Sc(H2O)2[BP2O8] | hexagonal | P6522 | a=9.535, c=15.768, Z=6 | [11] | ||||
NaSc[BP2O6(OH)3]·HPO4 | P21/c | [2] | ||||||
Ti[BP2O7(OH)3] | I41/amd | [2] | ||||||
V2[B(PO4)3] | [12] | |||||||
(VO)2BP2O10 | [13] | |||||||
Li3V2[BP3O12(OH)][HPO4] | P21/c | [2] | ||||||
Na2[VB3P2O12(OH)]·2.92H2O | I-43m | [12] | ||||||
NH4VIII[BP2O8(OH)] | monoclinic | P21/c | a=9.425, b=8.269, c=9.697, β=102.26°, Z=4 | 738.5 | [14] | |||
[ Im H2]3.8(H3O)1.2[(VIVO)4(BO)2(PO4)5]·0.3H2O | monoclinic | C2/c | a=9.4737, b=22.144, c=17.219, β=105.936°, Z=4 | layered | [15] | |||
[ en H2]2[Na(VO)10B(O)2(OPO3H)2}5]·22.5H2O | [16] | |||||||
[ trien H4]4H[NH4(VO)12{B(O)2(OPO3)2}6]·14H2O | orthorhombic | Pbca | a=21.45, b=16.315, c=29.65, Z=4 | 10378 | 1.920 | [17] | ||
[ trien H4]4H[K(VO)12{O3POB(O)2OPO3}6]·16H2O | orthorhombic | Pbca | a=21.537, b=16.267, c=29.717, Z=4 | 10411 | 1.996 | [17] | ||
KV[BP2O8(OH)] | triclinic | P1 | [2] | |||||
Cr2[B(PO4)3] | P63/m | [12] | ||||||
Na{Cr[BP2O7(OH)3]} | monoclinic | C2/c | a=10.4220, b=8.2468, c=9.2053, β=116.568°, Z=4 | 707.63 | [18] | |||
Na8[Cr4B12P8O44(OH)4][P2O7]·nH2O | I23 | [2] | ||||||
Na11K5[NaCr8B4P12O60H8]·H2O | Pmnn | [2] | ||||||
H2Mn5(H2O)6[BP2O8]4•4H2O | hexagonal | P6122 | a=9.655, c=15.791, Z=1.5 | pale pink | [19] | |||
Mn[BPO4(OH)2] | P3221 | a=7.5750, c=12.927, Z=6 | 642.37 | 3.020 | [20] | |||
LiMn(H2O)2[BP2O8(OH)]·H2O | P6522 | [2] | ||||||
[NH4]4[Mn9B2(OH)2(HPO4)4(PO4)6] | monoclinic | C2/c | a=32.603, b=10.617, c=10.718, β=108.26°, Z=4 | 3523 | 2.971 | light pink | [21] | |
(NH4)6[Mn3B6P9O36(OH)3]·4H2O | C2 | [2] | ||||||
(NH4)7Mn4(H2O)[B2P4O15(OH)2]2[H2PO4][HPO4] | Pnma | [2] | ||||||
(C3H12N2)[MnB2P3O12(OH)] | [2] | |||||||
(C4H12N2)[MnB2P3O12(OH)] | Ima2 | [2] | ||||||
NaMn(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.589, c=15.939 | loop branched chain | [8] | |||
Na5(H3O){Mn3[B3O3(OH)]3(PO4)6}·2H2O | hexagonal | P63/m | a=11.9683, c=12.1303, Z=2 | [22] | ||||
Na5(NH4)Mn3[B9P2O33(OH)3]·3/2H2O | P63 | [2] | ||||||
Na2[MnB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.940, c=12.098, Z=6 | 2.670 | colourless | [9] | ||
KMnBP2O7(OH)2 | monoclinic | P21/c | a=6.659, b=12.049, c=9.790, β=109.12°, Z=4 | 742.2 | orange-red luminescence | [23] | ||
KMn(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.639, c=15.931 | loop branched chain | [8] | |||
K5Mn2B2P5O19(OH)2 | P21/n | [2] | ||||||
FeIII2[B(PO4)3] | P63/m | [12] | ||||||
Fe[B2P2O7(OH)5] | monoclinic | C2/c | a=17.745, b=6.720, c=7.059, β=109.01°, Z=4 | 796 | 2.808 | unbranched chain | [1] | |
Fe(H2O)2BP2O8·H2O | hexagonal | a=9.4583, c=15.707, Z=6 | 1216.9 | 2.543 | [24] | |||
Fe[BPO4(OH)2] | P3221 | a=7.4844, c=12.844, Z=6 | 623.06 | 3.129 | [20] | |||
FeII(H2O)2[B2P2O8(OH)2]·H2O | P21/c | [2] | ||||||
Fe1.834IIFe0.166IIIB0.5[PO3(OH)]0.8(HPO3)2.033 | cubic | I43d | a=21.261, Z=48 | [25] | ||||
NH4FeIII[BP2O8(OH)] | monoclinic | P21/c | a=9.393, b=8.285, c=9.689, β=102.07°, Z=4 | 737.4 | [14] | |||
(NH4)0.75Fe(H2O)2[BP2O8]·1/4H2O | P6522 | [2] | ||||||
(C3H12N2)[FeB2P3O12(OH)] | Ima2 | [2] | ||||||
(C4H12N2)[FeB2P3O12(OH)] | Ima2 | [2] | ||||||
(dienH3)(dienH2)0.5[FeII*III2B4P7O26(OH)4] | P1 | [2] | ||||||
NaFe[BP2O7(OH)3] | triple | |||||||
sodium diaquoiron(II) catena-[monoboro-diphosphate] monohydrate | NaFe(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.499, c=15.931 | loop branched chain | [8] | ||
Na2[FeB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.812, c=12.067, Z=6 | 2.742 | light yellow | [9] | ||
potassium diaquoiron(II) catena-[monoboro-diphosphate] hemihydrate | KFe(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.510, c=15.952 | loop branched chain | [8] | ||
K2Fe2[B2P4O16(OH)2] | monoclinic | P21/c | a=9.372, b=8.146, c=9.587, β=101.18°, Z=2 | 718.0 | B2P2O4 ring with phosphate sides | [26] | ||
KFeBP2O8(OH) | P21/c | [2] | ||||||
CaFe[BP2O7(OH)3] | C2/c | [2] | ||||||
Ca0.5Fe(H2O)2[BP2O8]·H2O | P6522 | [2] | ||||||
Co5[BP3O14] | double + phosphate | [1] | ||||||
Co3[BPO7] | monoclinic | Cm | a=9.774, b=12.688, c=4.9057, β=119.749°, Z=4 | 528.2 | [27] | |||
Co[BPO4(OH)2] | P3121 | a=7.4554, c=12.7397, Z=6 | 613.24 | 3.229 | [20] | |||
(NH4)7Co4(H2O)[B2P4O15(OH)2]2[H2PO4][HPO4] | Pnma | [2] | ||||||
(NH4)8[Co2B4P8O30(OH)4] | P1 | [2] | ||||||
CoII(H2O)2[B2P2O8(OH)2]·H2O | P21/c | [2] | ||||||
[Co(en)3][B2P3O11(OH)2] | [28] | |||||||
CoB2P3O12(OH)·H2 en | [29] | |||||||
Co(C4H12N2)[B2P3O12(OH)] | orthorhombic | Ima2 | a=12.4635, b=9.4021, c=11.4513, Z=4 | 1341.90 | [30] | |||
H2Co5(H2O)6[BP2O8]4•4H2O | hexagonal | P6122 | a=9.639, c=15.931, Z=1.5 | purple | ||||
LiCo(H2O)2[BP2O8]·H2O | P6522 | |||||||
NaCo(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.455, c=15.847 | loop branched chain | [8] | |||
NaCoH2BP2O9 | monoclinic | P21/c | a=6.547, b=11.404, c=9.650, β=107.37 | 687.6 | 2.905 | pink; discovered in Tunisia | [31] | |
Na2[CoB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.759, c=12.099, Z=6 | 2.781 | purple | [9] | ||
Na5(H3O){Co3[B3O3(OH)]3(PO4)6}·2H2O | hexagonal | P63/m | a=11.7691, c=12.112, Z=2 | [22] | ||||
Na6Co3B2P5O21Cl·H2O | Pnma | |||||||
KCo(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.483, c=15.827 | loop branched chain | [8] | |||
CaCo(H2O)[BP2O8(OH)]·H2O | P1 | [2] | ||||||
(K0.17Ca0.42)Co(H2O)2[BP2O8]·H2O | P6522 | [2] | ||||||
(Co0.6Mn0.4)2(H2O)[BP3O9(OH)4] | P212121 | [2] | ||||||
cobalt borophosphate ethylenediamine | CoB2P3O12(OH)·en | orthorhombic | Pbca | a=9.3501, b=12.2426, c=20.880 | 2,390.1 | 2.471 | purple; layered | [32] [33] |
(NH4)7Co4(H2O)[B2P4O15(OH)2]2[H2PO4][HPO4] | Orthorhombic | Pnma | a=16.9206, b=10.5592, c=22.000, Z=4 | 3,930.6 | 2.386 | pink | [34] | |
(NH4)2(C4H12N2)[Co2B4P6O24(OH)2]·H2O | I41/a | [2] | ||||||
NiBPO4(OH)2 | P3121 | [2] | ||||||
Ni(H2O)2[B2P2O8(OH)2]·H2O | P21/c | [2] | ||||||
LiNi(H2O)2[BP2O8]·H2O | P6522 | [2] | ||||||
NaNi(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.371, c=15.831 | loop branched chain | [8] | |||
Na2[NiB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.728, c=12.074, Z=6 | 2.799 | yellow | [9] | ||
Na5(H3O){Ni3[B3O3(OH)]3(PO4)6}·2H2O | hexagonal | P63/m | a=11.7171, c=12.0759, Z=2 | [22] | ||||
KNi(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.392, c=15.842 | loop branched chain | [8] | |||
Cu3[B2P3O12(OH)3] | monoclinic | Cc | a=6.1895, b=13.6209, c=11.9373, β=97.62°, Z=4 | 997.5 | [35] | |||
Cu(H2O)2[B2P2O8(OH)2] | [36] | |||||||
Cu2(H2O)[BP2O8(OH)] | Pbca | [2] | ||||||
LiCu2[BP2O8(OH)2] | C2/c | [2] | ||||||
LiCu2[BP2O8(OH)2] | P212121 | [2] | ||||||
Na2[CuB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.554, c=12.314, Z=6 | 2.862 | sky-blue | [9] | ||
Na4Cu3[B2P4O15(OH)2]•2HPO4 | ring with side phosphate and extra phosphate | |||||||
Na5KCu3[B9P6O33(OH)3]·H2O | P63/m | [2] | ||||||
Zn(C4H12N2)[B2P3O12(OH)] | orthorhombic | Ima2 | a=12.4110, b=9.4550, c=11.4592, Z=4 | 1344.69 | [30] | |||
lithium zinc diaqua catena-[monoboro-diphosphate]-monohydrate | LiZn(H2O)2[BP2O8] · H2O | hexagonal | P61 | a=9.469, c=15.667, Z=6 | 1216.6 | spiral ribbons | [37] | |
Na[ZnBP2O8]⋅H2O | hexagonal | P6122 | a=9.5404, c=14.7780, Z=6 | 1164.88 | [38] | |||
NaZn(H2O)2[BP2O8]•H2O | hexagonal | P6122 | a=9.456, c=15.828 | loop branched chain | [8] | |||
Na2[ZnB3P2O11(OH)]·2/3H2O | hexagonal | P63 | a=11.963, c=12.363, Z=6 | 2.683 | colourless | [9] | ||
NH4[ZnBP2O8] | triclinic | P1 | a=7.437, b=7.612, c=7.850, α=119.05, β=101.59, γ=103.43, Z=2 | 351.18 | 2.687 | [39] | ||
Na[ZnBP2O8] | triclinic | P1 | [2] | |||||
K[ZnBP2O8] | monoclinic | C2/c | a=12.617, b=12.773, c=8.415, β=91.25°, Z=8 | 1355.8 | 2.991 | [39] | ||
[ trien H4]1.5[Zn6B6P12O48]·3/2H2O | hexagonal | P6522 | a=9.6685, c=14.8879; Z=1 | [40] | ||||
RBPO | Rb3B11P2O23 | Triclinic | P1 | a=7.785, b=7.839, c=7.963, α=89,774, β=89.129, γ=88.211, Z=2 | 485.6 | 2.753 | transparent above 168 nm; SHG 2.5× KDP; birefringence =0.071@1064 nm | [41] |
Rb[P2B2O8(OH)] | network | [1] | ||||||
Li3Rb2BP4O14 | Cmca | [2] | ||||||
K2RbB4PO10 | triclinic | P1 | a=6.5577, b=6.5931, c=13.098, α=84.626, β=80.514, γ=60.457, Z=2 | 485.9 | 2.719 | colourless | [10] | |
Rb2Co3(H2O)2[B4P6O24(OH)2] | orthorhombic | Pbca | a = 9.501, b = 12.272, c = 20.074, Z = 4 | [42] | ||||
Rb[ZnBP2O8] | triclinic | P1 | a=7.439, b=7.639, c=7.861, α=118.82, β=101.73, γ=103.51, Z=2 | 353.4 | 3.304 | [39] | ||
Sr[BPO5] | P3221 | loop branch B2PO3 rings | [1] | |||||
KSrBP2O8 | I42d | a=7.109, c=13.882 | [43] | |||||
SrFe[BP2O8(OH)2] | C2/c | [2] | ||||||
SrCo2BPO7 | monoclinic | P21/c | a=6.485, b=9.270, c=10.066, β=111.14, Z=4 | 548.7 | red | [44] | ||
AgMg(H2O)2[BP2O8]·H2O | P6522 | [2] | ||||||
2/3H2O | P6522 | [2] | ||||||
(Ag0.57Ni0.22)Ni(H2O)2[BP2O8]·2/3H2O | P6522 | [2] | ||||||
Na3Cd3BP4O16 | orthorhombic | Pmc21 | a=13.6854, b=5.335, c=18.2169, Z=4 | SHG 1.1×KDP | [2] [45] | |||
NH4Cd(H2O)2(BP2O8)·0.72H2O | hexagonal | P65 | a=9.698, c=16.026, Z=6 | 1305.3 | 2.886 | colourless | [46] | |
In2[B(PO4)3] | P63/m | [12] | ||||||
Cs[P2B2O8(OH)] | 3D network | [1] | ||||||
Li2Cs2B2P4O15 | ||||||||
K2CsB4PO10 | triclinic | P1 | a=6.6235, b=6.6243, c=13.273, α=79.734, β=86.558, γ=60.095, Z=2 | 496.46 | 2.979 | colourless | [10] | |
Cs2Cr3(BP4O14)(P4O13) | monoclinic | P21/c | a=14.7918, b=15.819, c=9.7037, β=92.450, Z=4 | 876.9 | 3.257 | green; [B(P2O7)2]5− | [47] | |
CsFe(BP3O11) | orthorhombic | Pnma | a=8.5375, b=12.7829, c=8.3346, Z=4 | 909.59 | 3.434 | [N(PO4)(P2O7)]4- | [47] | |
Cs2Co3(H2O)2[B4P6O24(OH)2] | orthorhombic | Pbca | a=9.5526, b=12.3190, c=20.1123 | 2366.8 | pink | [2] [48] | ||
Cs[ZnBP2O8] | triclinic | P1 | a=7.506, b=7.914, c=8.038, α=1198.05, β=102.96, γ=104.50, Z=2 | 373.9 | 3.545 | [39] | ||
Ba[BPO5] | P3221 | [2] | ||||||
Ba[BP3O12] | orthorhombic | Ibca | a=7.066, b=14.268, c=22.159 | 2233.9 | 4.209 | [1] [49] | ||
KBaBP2O8 | I42d | a=7.202, c=14.300 | [43] | |||||
BaFe[BP2O8(OH)] | P1 | [2] | ||||||
BaCo[BP2O8(OH)] | P1 | [2] | ||||||
Pb[BPO5] | loop branch B2PO3 rings | [1] | ||||||
Pb3[(PO4)2BPO4] | orthorhombic | Pbca | a=6.946, b=14.199, c=21.116, Z=8 | 2082.5 | 5.851 | open branch, 2 PO4 extra on each B | [49] | |
Na3PbII[B(O3POH)4] | I41/a | [2] | ||||||
KPbBP2O8 | I42d | [2] | ||||||
PbII4Cl{Co2[B(OH)2P2O8](PO4)2]} | R3c | [2] | ||||||
RbPbBP2O8 | I42d | [2] | ||||||
BiCo2BP2O10 | P21/m | [2] | ||||||
BiNi2BP2O10 | P21/m | [2] | ||||||
K2(UO2)12[B(H2PO4)4](PO4)8(OH)(H2O)6 | tetragonal | I42m | a=21.8747, c=7.0652 | 3380.7 | [50] | |||
K5(UO2)2[B2P3O12(OH)]2(OH)(H2O)2 | monoclinic | P21 | a=6.7623, b=19.5584, c=11.0110, β=95.579° | 1449.42 | [50] | |||
Ag2(NH4)3{(UO2)2[B3O(PO4)4(HPO4)2]}·H2O | P1 | [2] | ||||||
Ag2−x(NH4)3{(UO2)2[B2P5−yAsyO20−x(OH)x]} | Pcmn | [2] | ||||||
Cs3(UO2)3[B(PO4)4]∙(H2O)0.5 | P41212 | a=12.2376, c=33.9468, Z=4 | 5083.8 | yellow; microporous | [51] | |||
In chemistry tellurate is a compound containing an oxyanion of tellurium where tellurium has an oxidation number of +6. In the naming of inorganic compounds it is a suffix that indicates a polyatomic anion with a central tellurium atom.
Thiophosphates (or phosphorothioates, PS) are chemical compounds and anions with the general chemical formula PS
4−xO3−
x (x = 0, 1, 2, or 3) and related derivatives where organic groups are attached to one or more O or S. Thiophosphates feature tetrahedral phosphorus(V) centers.
The borate fluorides or fluoroborates are compounds containing borate or complex borate ions along with fluoride ions that form salts with cations such as metals. They are in the broader category of mixed anion compounds. They are not to be confused with tetrafluoroborates (BF4) or the fluorooxoborates which have fluorine bonded to boron.
Inorganic carbodiimides (or cyanamides depending on the NCN2- form) design a family of compounds containing the carbodiimide (or cyanamide) anion NCN2- bonded to an inorganic group such as a metal. This anion exhibits pseudochalcogenide character.
The borate carbonates are mixed anion compounds containing both borate and carbonate ions. Compared to mixed anion compounds containing halides, these are quite rare. They are hard to make, requiring higher temperatures, which are likely to decompose carbonate to carbon dioxide. The reason for the difficulty of formation is that when entering a crystal lattice, the anions have to be correctly located, and correctly oriented. They are also known as borocarbonates. Although these compounds have been termed carboborate, that word also refers to the C=B=C5− anion, or CB11H12− anion. This last anion should be called 1-carba-closo-dodecaborate or monocarba-closo-dodecaborate.
An oxyhydride is a mixed anion compound containing both oxide O2− and hydride ions H−. These compounds may be unexpected as the hydrogen and oxygen could be expected to react to form water. But if the metals making up the cations are electropositive enough, and the conditions are reducing enough, solid materials can be made that combine hydrogen and oxygen in the negative ion role.
The selenide iodides are chemical compounds that contain both selenide ions (Se2−) and iodide ions (I−) and one or metal atoms. They are in the class of mixed anion compounds or chalcogenide halides.
The sulfate fluorides are double salts that contain both sulfate and fluoride anions. They are in the class of mixed anion compounds. Some of these minerals are deposited in fumaroles.
The telluride iodides are chemical compounds that contain both telluride ions (Te2−) and iodide ions (I−). They are in the class of mixed anion compounds or chalcogenide halides.
A selenite fluoride is a chemical compound or salt that contains fluoride and selenite anions. These are mixed anion compounds. Some have third anions, including nitrate, molybdate, oxalate, selenate, silicate and tellurate.
The borosulfates are heteropoly anion compounds which have sulfate groups attached to boron atoms. Other possible terms are sulfatoborates or boron-sulfur oxides. The ratio of sulfate to borate reflects the degree of condensation. With [B(SO4)4]5- there is no condensation, each ion stands alone. In [B(SO4)3]3- the anions are linked into a chain, a chain of loops, or as [B2(SO4)6]6− in a cycle. Finally in [B(SO4)2]− the sulfate and borate tetrahedra are all linked into a two or three-dimensional network. These arrangements of oxygen around boron and sulfur can have forms resembling silicates. The first borosulfate to be discovered was K5[B(SO4)4] in 2012. Over 75 unique compounds are known.
Borate nitrates are mixed anion compounds containing separate borate and nitrate anions. They are distinct from the boronitrates where the borate is linked to a nitrate via a common oxygen atom.
Borate phosphates are mixed anion compounds containing separate borate and phosphate anions. They are distinct from the borophosphates where the borate is linked to a phosphate via a common oxygen atom. The borate phosphates have a higher ratio of cations to number of borates and phosphates, as compared to the borophosphates.
The borate bromides are mixed anion compounds that contain borate and bromide anions. They are in the borate halide family of compounds which also includes borate fluorides, borate chlorides, and borate iodides.
The borate iodides are mixed anion compounds that contain both borate and iodide anions. They are in the borate halide family of compounds which also includes borate fluorides, borate chlorides, and borate bromides.
The oxalate phosphates are chemical compounds containing oxalate and phosphate anions. They are also called oxalatophosphates or phosphate oxalates. Some oxalate-phosphate minerals found in bat guano deposits are known. Oxalate phosphates can form metal organic framework compounds.
A selenate selenite is a chemical compound or salt that contains selenite and selenate anions (SeO32- and SeO42-). These are mixed anion compounds. Some have third anions.
Selenidogermanates are compounds with anions with selenium bound to germanium. They are analogous with germanates, thiogermanates, and telluridogermanates.
Phosphide iodides or iodide phosphides are compounds containing anions composed of iodide (I−) and phosphide (P3−). They can be considered as mixed anion compounds. They are in the category of pnictidehalides. Related compounds include the phosphide chlorides, arsenide iodides antimonide iodides and phosphide bromides.
Oxalate sulfates are mixed anion compounds containing oxalate and sulfate. They are mostly transparent, and any colour comes from the cations.